EP2630615B1 - Appareil comportant des moyens de communication par couplage inductif - Google Patents

Appareil comportant des moyens de communication par couplage inductif Download PDF

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Publication number
EP2630615B1
EP2630615B1 EP11785041.2A EP11785041A EP2630615B1 EP 2630615 B1 EP2630615 B1 EP 2630615B1 EP 11785041 A EP11785041 A EP 11785041A EP 2630615 B1 EP2630615 B1 EP 2630615B1
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EP
European Patent Office
Prior art keywords
antenna coil
loops
equal
antenna
turn
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EP11785041.2A
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German (de)
English (en)
French (fr)
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EP2630615A2 (fr
Inventor
Nicolas Cordier
Florian Pernisek
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Inside Secure SA
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Inside Secure SA
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Priority to EP17198242.4A priority Critical patent/EP3306520B1/fr
Publication of EP2630615A2 publication Critical patent/EP2630615A2/fr
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    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/12—Supports; Mounting means
    • H01Q1/22—Supports; Mounting means by structural association with other equipment or articles
    • H01Q1/24—Supports; Mounting means by structural association with other equipment or articles with receiving set
    • H01Q1/241—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM
    • H01Q1/242—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use
    • H01Q1/243—Supports; Mounting means by structural association with other equipment or articles with receiving set used in mobile communications, e.g. GSM specially adapted for hand-held use with built-in antennas
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06F—ELECTRIC DIGITAL DATA PROCESSING
    • G06F1/00—Details not covered by groups G06F3/00 - G06F13/00 and G06F21/00
    • G06F1/16—Constructional details or arrangements
    • G06F1/1613—Constructional details or arrangements for portable computers
    • G06F1/1633—Constructional details or arrangements of portable computers not specific to the type of enclosures covered by groups G06F1/1615 - G06F1/1626
    • G06F1/1684—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675
    • G06F1/1698—Constructional details or arrangements related to integrated I/O peripherals not covered by groups G06F1/1635 - G06F1/1675 the I/O peripheral being a sending/receiving arrangement to establish a cordless communication link, e.g. radio or infrared link, integrated cellular phone
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/0008—General problems related to the reading of electronic memory record carriers, independent of its reading method, e.g. power transfer
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10237—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the reader and the record carrier being capable of selectively switching between reader and record carrier appearance, e.g. in near field communication [NFC] devices where the NFC device may function as an RFID reader or as an RFID tag
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10316—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers
    • G06K7/10336—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves using at least one antenna particularly designed for interrogating the wireless record carriers the antenna being of the near field type, inductive coil
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10009—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves
    • G06K7/10366—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications
    • G06K7/10376—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable
    • G06K7/10386—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation sensing by radiation using wavelengths larger than 0.1 mm, e.g. radio-waves or microwaves the interrogation device being adapted for miscellaneous applications the interrogation device being adapted for being moveable the interrogation device being of the portable or hand-handheld type, e.g. incorporated in ubiquitous hand-held devices such as PDA or mobile phone, or in the form of a portable dedicated RFID reader
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q1/00—Details of, or arrangements associated with, antennas
    • H01Q1/50—Structural association of antennas with earthing switches, lead-in devices or lightning protectors
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H—ELECTRICITY
    • H01—ELECTRIC ELEMENTS
    • H01Q—ANTENNAS, i.e. RADIO AERIALS
    • H01Q7/00—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop
    • H01Q7/005—Loop antennas with a substantially uniform current distribution around the loop and having a directional radiation pattern in a plane perpendicular to the plane of the loop with variable reactance for tuning the antenna
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/20—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by the transmission technique; characterised by the transmission medium
    • H04B5/24—Inductive coupling
    • H04B5/26—Inductive coupling using coils
    • H04B5/266—One coil at each side, e.g. with primary and secondary coils
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/40—Near-field transmission systems, e.g. inductive or capacitive transmission systems characterised by components specially adapted for near-field transmission
    • H04B5/43—Antennas
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04B—TRANSMISSION
    • H04B5/00—Near-field transmission systems, e.g. inductive or capacitive transmission systems
    • H04B5/70—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes
    • H04B5/72—Near-field transmission systems, e.g. inductive or capacitive transmission systems specially adapted for specific purposes for local intradevice communication
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M1/00—Substation equipment, e.g. for use by subscribers
    • H04M1/72—Mobile telephones; Cordless telephones, i.e. devices for establishing wireless links to base stations without route selection
    • H04M1/724—User interfaces specially adapted for cordless or mobile telephones
    • H04M1/72403—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality
    • H04M1/72409—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories
    • H04M1/72412—User interfaces specially adapted for cordless or mobile telephones with means for local support of applications that increase the functionality by interfacing with external accessories using two-way short-range wireless interfaces
    • H—ELECTRICITY
    • H04—ELECTRIC COMMUNICATION TECHNIQUE
    • H04M—TELEPHONIC COMMUNICATION
    • H04M2250/00—Details of telephonic subscriber devices
    • H04M2250/04—Details of telephonic subscriber devices including near field communication means, e.g. RFID

Definitions

  • the present invention relates to an apparatus comprising inductively coupled communication means configured to communicate in peer-to-peer mode with an identical apparatus, the communication means comprising a communication controller and a planar antenna coil tuned to a frequency of work, connected to the controller via two connection points and having N turns arranged in series between the two connection points.
  • the present invention also relates to a method for limiting the frequency mismatch between a first and a second identical planar antenna coil tuned to a working frequency, when the antenna coils are arranged opposite each other at the same time. a distance of less than 10 millimeters.
  • the present invention also relates to a method for establishing inductive coupling communication between two identical apparatuses each comprising inductively coupled communication means configured to communicate in peer-to-peer mode.
  • the present invention generally relates to inductive coupling communication techniques also known as Near Field Communications (NFC) or Near Field Communication.
  • NFC Near Field Communications
  • Inductive coupling communication generally involves a so-called passive NFC device and an NFC device said active, both equipped with an antenna coil tuned to a working frequency, for example 13.56 MHz.
  • the active device emits a magnetic field oscillating at the working frequency, and sends data to the passive device by modulating the magnetic field.
  • the passive device receives a voltage induced by the magnetic field, which it demodulates to extract the data it contains, and sends data to the active device by load modulation.
  • NFC devices equipped with NFC devices in particular NFC mobile phones, generally have three modes of operation: a “reader” mode, a “card emulation” mode, and a “peer-to-peer” mode of operation. -to-post. " The present invention further relates (particularly peer-to-peer communications between two identical apparatuses.
  • two devices are arranged face to face, one being in active mode and emitting the magnetic field, the other being in passive mode and receiving the magnetic field in the form of a voltage induced in its antenna coil.
  • the design of the antenna coil should generally take into account the standards and constraints applicable to contactless cards, those applicable to contactless card readers, and the constraints specific to the peer-to-peer mode of operation.
  • ISO / IEC 7810 specifies a rectangular "ID-1" format for contactless cards used primarily in the area of transport and payment.
  • the format of the player and its antenna is not standardized.
  • the magnetic field produced by the antenna coil of the reader must respect certain limits and its performances are verified during the certification of the reader.
  • certification tests are based on the ISO / IEC 10373-6 standard, while the "EMV contactless protocol 2.0" standard is generally applied in the field of payment.
  • the antenna coil of an NFC device is generally flat and extends near the inner face of a wall of the device housing, for example its rear wall. Communication in peer-to-peer mode therefore usually requires the mutual placement of the walls of the two devices near which the antenna coils are arranged.
  • the antenna coils of the two devices can be intimately juxtaposed, their respective turns being opposite each other.
  • the rear walls of the housings are generally thin, they can be very close to each other, generally at a distance of less than 10 millimeters.
  • the present invention includes the observation that when a small distance separates two identical antenna coils placed opposite each other, this results in a strong inductive coupling which disables the frequency matching of each antenna coil and causes its coefficient to drop Q. This has the effect of greatly reducing the amplitude of the signal transmitted by the transmitting antenna coil and reducing strongly the amplitude of the voltage received by the receiving antenna coil. Against all odds, these losses can be such that they then prevent communication between the two devices, despite the fact that they are very close to each other.
  • each antenna comprising two nested plane turns extending along a rectangular contour 31 millimeters (mm) wide and 51 mm in length, the planes of the antenna coils being separated by a distance of 5 mm and then 1 mm.
  • the maximum transmission is obtained at a frequency of around 14 MHz instead of 13.56 MHz, which indicates a slight mismatch caused by the coupling, and the transmission losses are order of -6 dB. This means that 50% of the magnetic field is transmitted.
  • the antenna coils With a separation distance of 1 mm, the antenna coils are completely mismatched with a low quality coefficient and the maximum transmission is around 23 MHz. The bringing together of the two antenna coils therefore causes in this case a significant shift in their tuning frequency, here from 13.56 MHz to 23 MHz. As a result, the transmission losses at 13.56 MHz increase dramatically as the antenna coils are no longer tuned to the working frequency of 13.56 MHz, and are of the order of -10 dB: only 32% the magnetic field is then transmitted.
  • the patent application GB 2 358 991 A describes an NFC phone that is intended to communicate with another NFC phone of the same type.
  • the patent application US 2004/0256468 discloses antenna coils integrated in an NFC telephone for reading contactless cards and without the peer-to-peer communication mode.
  • the antenna coils shown on the figures 6 , 7A, 8 of this document have a symmetrical structure relative to a longitudinal axis Z of the telephone ( Fig.
  • the antenna coils represented on the Figures 9 and 10 of this document have four turns and have an asymmetrical shape relative to the longitudinal axis Z, so that a non-contact card can be read even when it is arranged at a point remote from the center of the antenna coil, by example above a keyboard 71 of the phone ( Fig. 11 ).
  • Embodiments of the invention relate to an apparatus according to claim 1.
  • the number N of turns of the antenna coil arranged in series between the two connection points is at most equal to 3.
  • the antenna coil has a recovery rate less than or equal to 0.7 regardless of its number of turns.
  • the antenna coil comprises at least one turn having a recovery rate of zero.
  • the antenna coil comprises at least one composite coil comprising two juxtaposed turns having no common surface.
  • the antenna coil comprises at least one additional tuning coil arranged between one of the two connection terminals and at least one third connection terminal, an additional tuning coil not operating in determining the recovery rate of the antenna coil.
  • the antenna coil is arranged near a wall of the apparatus having a median longitudinal axis, and the antenna coil has an axis.
  • median longitudinal coincides with the median longitudinal axis of the wall.
  • the antenna coil is arranged near a wall of the apparatus, in a plane located less than 5 millimeters from an outer face of the wall.
  • Embodiments of the invention also relate to a method according to claim 9.
  • the method comprises a step of choosing a number N of turns arranged in series between the two connection points which is at most equal at
  • the method comprises a step of giving each antenna coil a recovery rate less than or equal to 0.7 regardless of its number of turns.
  • the method comprises a step of providing in each antenna coil at least one turn having a recovery rate of zero.
  • the method comprises a step of providing in each antenna coil at least one composite coil comprising two juxtaposed turns having no common surface.
  • the method comprises a step consisting in providing in each antenna coil at least one additional tuning coil arranged between one of the two connection terminals and at least one third connection terminal, and not take into account the additional tuning loop in determining the antenna coil recovery rate.
  • Embodiments also relate to a method according to claim 15.
  • the method comprises a step of choosing a number N of turns arranged in series between the two connection points which is at most equal to.
  • the method comprises a step of conferring on each antenna coil a recovery rate less than or equal to 0.7 regardless of its number of turns.
  • the method comprises a step of providing in each antenna coil at least one turn having a recovery rate of zero.
  • the method comprises a step of providing in each antenna coil at least one composite coil comprising two juxtaposed turns having no common surface.
  • the method comprises a step consisting in providing in each antenna coil at least one additional tuning coil arranged between one of the two connection terminals and at least one third connection terminal, and not take into account the additional tuning loop in determining the antenna coil recovery rate.
  • the method comprises the steps of conferring on the antenna coil a shape having a median longitudinal axis, and arranging the antenna coil near a wall of the apparatus having a median longitudinal axis located halfway from the side edges of the wall, so that the median longitudinal axis of the antenna coil coincides with the median longitudinal axis of the wall.
  • the figure 1 represents a portable DV device, for example a mobile phone.
  • the apparatus DV comprises, arranged in a housing 1, an application device D1 and a communication device D2.
  • the devices D1, D2 are connected by a communication interface 5, for example a data bus.
  • the application device D1 comprises, for example, a GSMCT radio communication circuit and a PROC processor.
  • the GSMCT circuit is connected to a UHF antenna 16 and is configured to provide for the establishment of a data link with a telecommunication network.
  • the processor PROC is for example a baseband processor.
  • the device D2 is an NFC communication device comprising an NFC controller, designated NFCCT, equipped with an antenna circuit ACT.
  • the antenna circuit ACT comprises an antenna coil AC and components CX (capacitors for example) for tuning the antenna coil AC on a working frequency, for example 13.56 MHz.
  • the controller NFCCT is configured to provide inductive coupling communication between the DV apparatus and an external NFC component (not shown) via the AC antenna coil.
  • the external component can be a contactless smart card when the device D2 operates in reader mode, a card reader without contact when the device D2 operates in card emulation mode, or a DV device 'identical to the DV device when the DV device operates in peer-to-peer mode.
  • the processor PROC of the application device D1 can be configured as the host processor of the controller NFCCT, to manage applications in drive mode or in peer-to-peer mode.
  • the figure 2 is a schematic sectional view of the DV apparatus also showing the AC antenna coil sectional view.
  • This comprises a flat conductor 10 arranged on an insulating support 11 and is arranged near a wall 2 of the housing 1, for example its rear wall.
  • the figure 2 also shows another DV 'apparatus identical to the DV apparatus, having an antenna coil AC' identical to the antenna coil AC, and comprising a conductor 10 'on an insulating support 11' and arranged near a wall 2 'of the housing 1' of the device DV '.
  • the configuration shown is that of a peer-to-peer communication between the two DV, DV 'devices.
  • the wall 2 'of the apparatus DV' is contiguous to the wall 2 of the apparatus DV, the antenna coils AC, AC 'are mutually opposite and very close to each other, generally at a distance less than 10 millimeters.
  • the antenna coils are generally bonded to the wall 2 by means of an adhesive tape.
  • a double-sided adhesive has a thickness of the order of 30 microns, much less than one millimeter.
  • a mobile phone wall may be locally thinned and have a thickness less than one millimeter.
  • the minimum distance between two antenna coils can be of the order of one millimeter.
  • Embodiments of the invention relate to structures of the antenna coil AC for reducing the frequency mismatch of each antenna coil AC, AC 'in a peer-to-peer communication corresponding to the configuration of the figure 2 . It is desired to limit this frequency discrepancy within a range of plus or minus 20% when the antenna coils AC, AC 'are arranged in maximum mutual relation, which corresponds in practice to the "worst case" in terms of frequency mismatch.
  • the present invention provides a parameter called "recovery rate".
  • This recovery rate is determined when the antenna coil is arranged in a maximal mutual relation with itself (or with an identical antenna coil), and is equal to the sum ⁇ FSWi of the mutually facing surfaces FSWi of turns SWi of the same rank of the antenna coil, divided by the sum ⁇ SWi of the surfaces SWi of the turns Wi of the antenna coil.
  • the so-called “maximum mutual facing” arrangement is an arrangement in which the sum ⁇ FSWi of the mutually facing surfaces FSWi of coils SWi of the same rank of the antenna coil is maximum. This arrangement is generally obtained when median and transverse longitudinal axes of the two identical antenna coils are aligned (ie superimposed).
  • the present invention also includes the discovery that, in order to limit the frequency mismatch of the antenna coil AC within a range of acceptable values, for example of the order of plus or minus 20%, when this is arranged in maximum mutual view of an identical antenna coil AC ', the antenna coil AC must have, relative to its median or transverse median longitudinal axis, an asymmetry corresponding to a recovery rate less than or equal to 0.6 if it has 4 turns or more, less than or equal to 0.7 if it has 3 turns, or less than or equal to 0.8 if it has 1 or 2 turns.
  • the axis in which an antenna coil AC has an asymmetry must be the axis in which it is placed opposite the antenna coil AC 'during a post-application to -Posted.
  • This axis is generally the median longitudinal axis of the antenna coil if it is parallel to or coincident with the median longitudinal axis of the housing 1, since the DV, DV 'devices are generally arranged in the same direction when they are contiguous in peer-to-peer mode. If users of the devices are instructed to orient them in reverse directions during peer-to-peer (ie head-to-toe) communication, the asymmetry will then be predicted.
  • the term "median longitudinal axis" of an antenna coil will be referred to as the axis of the antenna coil which is parallel to or coincides with the median longitudinal axis of the wall of the antenna. casing carrying the antenna coil, including assuming that the geometrical median longitudinal axis of the antenna coil is transverse to this axis (case of an antenna coil which would not extend over the entire length of the wall and have a rectangular shape transverse to it).
  • Embodiments AC1, AC2, AC3, AC4, AC5, AC5 of the antenna coil AC will now be described.
  • the antenna coil AC1 shown on the figure 3 comprises a first turn W1 of substantially rectangular shape (the diagram shows sharp angles that could be rounded in practice) and a second turn W2 also rectangular in shape, extending inside the turn W1.
  • the turns W1, W2 are formed by the conductor 10 on the insulating support 11, whose ends are connected to connection terminals or contacts C1, C2 connected to the controller NFCCT (Cf. Fig. 1 ).
  • the conductor 10 here has a crossing or overlap zone 12 where it passes over itself via an insulating layer (not shown). In other embodiments, the overlap zone could be provided by another conductor, buried in the insulating support 11.
  • the turn W1 occupies the major part of the surface of the wall 2.
  • the turn W1 thus has a median longitudinal axis AW1 which coincides with a median longitudinal axis A2 of the wall 2 (axis that extends halfway from the edges of the wall 2).
  • the axis AW1 also forms the overall median longitudinal axis A1 of the antenna coil AC1, that is to say an axis located midway from the extreme lateral edges of the antenna coil.
  • "L1" denotes the width of the turn W1.
  • the axes AW1, A1 are therefore at a distance equal to L1 / 2 of the two edges of the turn W1.
  • the turn W2 has a width L2 less than L1 and has, at mid-distance from its edges (L2 / 2), a median longitudinal axis AW2 which is offset relative to the median longitudinal axis A1, AW1. More precisely, the left edge of the turn W2 extends here at a distance L3 from the median longitudinal axis A1, AW1 representing 5% of its width L2.
  • the mutual facing surface FSW2 of the turn W2 of the antenna coil AC1 and a turn W2 'of the same rank of the antenna coil AC1' is equal to 1/10 of the surface SW2 of the turn W2 .
  • the mutually facing surface FSW1 of the turn W1 of the antenna coil AC1 and a turn W1 'of the same rank of the antenna coil AC1' is equal to the surface SW1 of the turn W1 because the turn W1 is perfectly symmetrical.
  • the distance L3 is equal to 0.
  • the area covered by the turn W2 has no part to the left of the median longitudinal axis A1 of the antenna coil and the turn has a individual recovery rate equal to zero (total dissymmetry).
  • the antenna coil AC1 then has a recovery rate equal to 1 / 1.5 or 0.66.
  • the turn W2 has an individual recovery rate equal to 0 and a surface equal to 0.45 times the surface of the turn W1. In this case the antenna coil AC1 has a recovery rate equal to 1 / 1.45 or 0.69.
  • the figure 5 represents an antenna coil AC2 having only a turn W3, non-symmetrical shape.
  • the turn W3 has a median longitudinal axis AW3 which forms the overall median longitudinal axis A1 of the coil and coincides with the median longitudinal axis A2 of the wall 2.
  • turn W3 has straight sections S1 of the conductor 10 which are parallel to the axis AW3 and straight sections S2, S3, S4 of the conductor 10 which follow directions X2, X3, X4 having angles a2, a3, a4 of between 10 and 80 ° relative to the median longitudinal axis AW3.
  • the figure 7 represents an antenna coil AC3 comprising two turns W4, W5, the turn W5 extending inside the turn W4.
  • the conductor 10 has a cross point 12 located on the lower part of the turns, opposite the contacts C1, C2.
  • the turns W4, W5 have substantially the same shape as the turn W3 described above, and each have an individual recovery rate of less than 0.7. It follows that the recovery rate of the antenna coil AC3 considered as a whole is also less than 0.7.
  • the figure 8 represents an antenna coil AC4 comprising a large turn W6 of substantially rectangular shape, inside which extends a composite turn W7 consisting of two turns W7a, W7b juxtaposed and disjoint (ie having no common surface) which are also of substantially rectangular shape.
  • the antenna coil AC4 has a median longitudinal axis A1 corresponding to the median longitudinal axis AW6 of the turn W6 and coinciding here with the median longitudinal axis of the wall 2 of the apparatus.
  • the conductor 10 forming the antenna coil has two crossing zones 12, 12 'near the turns W7a, W7b.
  • the turns W7a, W7b are juxtaposed so that the resulting composite turn W7 has an individual recovery ratio equal to 0. More particularly, the turn W7a has an area less than or equal to a quarter of the surface of the turn W6 and is arranged in the upper right-hand corner of the W6 turn.
  • the turn W7b has a surface less than or equal to a quarter of the surface of the turn W6 and is arranged in the lower left dial of the turn W6.
  • the composite turn W7 thus having a recovery ratio equal to 0. If the surface of each turn W7a, W7b is equal to 1/4 of the surface of the turn W6, the coverage rate of the antenna coil AC4 is equal to (1 + 0 + 0) / (1 + 0.25 + 0.25) is 1 / 1.5, which is still 0.66.
  • the figure 9 represents an antenna coil AC5 comprising a large substantially rectangular turn W8 and two bi-rectangular turns, the turn W9 extending inside the turn W8 and the turn W10 inside the turn W9.
  • the turn W8 has a median longitudinal axis AW8 forming the median longitudinal axis A1 of the antenna coil AC5, which here coincides with the central longitudinal axis A2 of the wall 2 of the housing.
  • the turns W9, W10 each traverse a path corresponding to the perimeter of a shape consisting of two rectangles R1, R2 arranged side by side and on either side of the median longitudinal axis A1.
  • the rectangle R2 has the same width as the rectangle R1 and a length equal to one quarter of the length of the rectangle R2.
  • the individual recovery rate of each turn W9, W10 is twice the area of R2 divided by the area of R1 plus the area of R2, ie 2 * 1 * 0.25 / (1 + 0, 25) considering that the surface of rectangle R1 is equal to 1, ie a recovery rate equal to 0.4.
  • the figure 10 represents an antenna coil AC6 comprising two bi-rectangular turns W11, W12 each traversing a path corresponding to the perimeter of a shape consisting of two rectangles R1, R3 arranged side by side.
  • the turns W11, W12 have a median longitudinal axis AW11, AW12 which forms the median longitudinal axis A1 of the antenna coil AC6 and which here coincides with the median longitudinal axis A2 of the wall 2 of the housing.
  • the rectangles R1 and R3 have the same width and are arranged on either side of the axis A1.
  • the rectangle R3 is assumed to be half the length of the rectangle R1 (the diagram of the figure 10 being approximate).
  • the individual recovery rate of each turn W11, W12 is equal to twice the area of R3 divided by the sum of the area of R3 and the area of R1, ie (2 x 0.5) / 1.5, or again 0.66. Since the turns have the same shape, and neglecting the surface of the conductor 10 and the interspire distance, the recovery rate of the antenna coil AC6 is substantially equal to the individual recovery rate of each of the turns, ie 0.66.
  • the present invention also applies to multi-tap antenna coils of the type described in the international application. WO 2010/066799 .
  • This type of antenna coil comprises at least one additional tuning coil arranged between one of the two connection terminals C1, C2 of the antenna coil to the controller NFCCT, and at least one third connection terminal C3.
  • the additional tuning coil is not involved in determining the antenna coil recovery rate, but is taken into account in determining the maximum mutual arrangement from which the recovery rate is calculated.
  • the antenna coil AC7 is of the same shape as the antenna coil AC1 of the figure 3 and comprises a large turn W13 of the same shape as the turn W1 of the figure 3 , and a small turn W14 of the same shape as the turn W2 of the figure 3 .
  • the antenna coil AC7 differs from the antenna coil AC1 in that the contact C2 is arranged at the end of the turn W14, and in that a contact C3 is arranged at the end of the turn W13.
  • the turn W14 extends between the contacts C1 and C2 and the turn W13 extends between the contacts C2 and C3.
  • tuning components CX can be arranged between terminals C1 and C2 and / or between terminals C2 and C3, and / or between terminals C1 and C3.
  • the coverage rate of the antenna coil is determined relative to turn W14 only, relative to an arrangement of the antenna coil facing each other with a similar antenna coil AC7 '(FIG. See for example the figure 4 ).
  • the layout Maximum mutual look is determined by taking into account all the turns W13, W14 of the antenna coil. According to the definition described above, the maximum mutual facing arrangement is therefore an arrangement in which the sum ⁇ FSWi of the mutually facing surfaces FSWi of turns SWi of the same rank of the antenna coil is maximum. Once the maximum mutual arrangement has been determined, the turn W13 is not taken into account for the calculation of the recovery rate of the antenna coil AC7, which is therefore equal here to the individual recovery rates of the turn W14. .
  • the individual recovery rate of the turn W14 is equal to 0.1 if the left edge of the turn W14 extends to the left of the median longitudinal axis A1 of the antenna coil, at a distance L3 which is equal to 5% of the width of the turn W14.
  • Embodiments of the invention are generally applicable to any application in which two tuned antenna coils must be arranged facing each other and at a short distance from each other, when this short distance is susceptible detuning the antenna coils and reducing the transmission of the electrical signal between the two antenna coils.

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EP11785041.2A 2010-10-19 2011-10-19 Appareil comportant des moyens de communication par couplage inductif Active EP2630615B1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
EP17198242.4A EP3306520B1 (fr) 2010-10-19 2011-10-19 Appareil comportant des moyens de communication par couplage inductif

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
FR1004096A FR2966267A1 (fr) 2010-10-19 2010-10-19 Appareil comportant un dispositif de communication en champ proche par couplage inductif
PCT/FR2011/000562 WO2012052631A2 (fr) 2010-10-19 2011-10-19 Appareil comportant des moyens de communication par couplage inductif

Related Child Applications (2)

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EP17198242.4A Division-Into EP3306520B1 (fr) 2010-10-19 2011-10-19 Appareil comportant des moyens de communication par couplage inductif
EP17198242.4A Division EP3306520B1 (fr) 2010-10-19 2011-10-19 Appareil comportant des moyens de communication par couplage inductif

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EP2630615B1 true EP2630615B1 (fr) 2017-11-29

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US9401745B1 (en) * 2009-12-11 2016-07-26 Micron Technology, Inc. Wireless communication link using near field coupling
FR2966267A1 (fr) 2010-10-19 2012-04-20 Inside Contactless Appareil comportant un dispositif de communication en champ proche par couplage inductif
TW201417122A (zh) * 2012-10-22 2014-05-01 Espower Electronics Inc 感應耦合電能傳輸與電場耦合電能傳輸兩用線圈
JP6199803B2 (ja) * 2014-05-22 2017-09-20 株式会社東海理化電機製作所 アンテナ装置
US9642014B2 (en) 2014-06-09 2017-05-02 Nokomis, Inc. Non-contact electromagnetic illuminated detection of part anomalies for cyber physical security
US20160126639A1 (en) * 2014-10-14 2016-05-05 Samsung Electro-Mechanics Co., Ltd. Coil structure and wireless power receiving apparatus including the same
KR102257892B1 (ko) * 2014-11-26 2021-05-28 삼성전자주식회사 개선된 ｎｆｃ 안테나 및 그 안테나를 갖는 전자 장치
EP4270805A1 (fr) * 2022-04-29 2023-11-01 The Swatch Group Research and Development Ltd Transpondeur muni d'une antenne spirale

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GB2358991B (en) * 1999-09-14 2002-02-13 Motorola Inc Wireless radio frequency peripheral interface for a cellular communication device
JP2001309013A (ja) * 2000-04-27 2001-11-02 Mitsubishi Electric Corp 非接触信号伝送装置
US6650213B1 (en) * 2000-06-02 2003-11-18 Yamatake Corporation Electromagnetic-induction coupling apparatus
JP4273734B2 (ja) * 2002-09-25 2009-06-03 ソニー株式会社 アンテナ装置
JP4232474B2 (ja) * 2002-09-27 2009-03-04 ソニー株式会社 通信機能付き電子機器
US7973722B1 (en) * 2007-08-28 2011-07-05 Apple Inc. Electronic device with conductive housing and near field antenna
US20100093412A1 (en) * 2008-10-09 2010-04-15 Inside Contactless Protective envelope for a handheld electronic device
WO2010066955A1 (fr) 2008-12-11 2010-06-17 Yves Eray Circuit d'antenne rfid
FR2966267A1 (fr) 2010-10-19 2012-04-20 Inside Contactless Appareil comportant un dispositif de communication en champ proche par couplage inductif

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WO2012052631A2 (fr) 2012-04-26
CN103688270A (zh) 2014-03-26
CN103688270B (zh) 2016-10-19
EP2630615A2 (fr) 2013-08-28
WO2012052631A3 (fr) 2015-07-02
US9941575B2 (en) 2018-04-10
FR2966267A1 (fr) 2012-04-20
EP3306520A1 (fr) 2018-04-11
US20130183897A1 (en) 2013-07-18
EP3306520B1 (fr) 2021-05-05
US9473215B2 (en) 2016-10-18
US20160380339A1 (en) 2016-12-29

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